Hikvisions Quad-Brid Open Technology offers one single DVR which is compatible with 4 technologies – Analog, HDTVI, IP and AHD. It Is a one stop solution for all your surveillance needs where you do not have to worry about DVR-Camera compativility; Analog, HDTM, IP and AHD cameras can be used simultaneously. The DVR auto detects the input and adjusts the recording resolution depending on the camera specificationsQuad-Brid 4 a solution, where the existing infrastructure is kept intact and only the DVR is changed – enabling HD output with the current analogue system and flexibility to map expansion needs in the future with IP or AHD cameras. Seamlessly compatible with 3rd party surveillance cameras. the Quad-Brid DVR can be used with any brand of existing cameras on your Infrastructure for maximum flexibility.